Answer: postcard

AnswerCrossword Clue
POSTCARDMailed memento
POSTCARDStandby of most tourists.
POSTCARDCorrespondent's item.
POSTCARDArmy-base cut-up?
POSTCARD"Wish-you-were-here" medium
POSTCARD"Wish you were here" medium
POSTCARDContest entry, perhaps
POSTCARDDeltiologist's purchase
POSTCARDMail that isn't opened
POSTCARDTourist purchase
POSTCARDVacationer's mailing
postcarda card for use in the mail
postcardA card for sending a message by mail without an envelope, typically having a photograph or other illustration on one side